Pneumatic door-check



(No Model.)

G. R. ELLIOTT.

PNEUMATIG DOOR CHECK.

No. 329,296. Patented Oct. 27, 1885.

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NA PETERS, Phomumognpher, wnmingxo", D. C.

UNITED STATES ATENT OFFICE.

GILBERT R. ELLIOTT, OF BOSTON, MASSACHUSETTS.

PNEUMATIC DOOR-CHECK.

SPECIFICATION forming part of Letters Patent No.329,296, dated October 27, 1885.

(No model.)

To @ZZ whom, it may concern:

Be it known that I, GILBERT R. ELLIOTT, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Pneumatic Door- Checks; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the saine, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form part of this specication.

This invention relates to pneumatic doorchecks, by which they are made more durable and lasting, simplified in their construction, and cheaper in first cost, readily manipulated, and easy of repair.

The object of the invention is to prevent doors or gates from slamming, and therefore prevent the violent noise incident thereto, and also to prevent breakage of glass in doors, which very often occurs from the violent shutting` thereof, by gusts of wind or otherwise.

To these ends my invention consists in a spring toggle-joint mechanism, whereby when the door is shut the springs and toggle-connections will force the piston and buffer to resume proper position for the next closing movement of the door, to provide means for preventing the rattling or shaking of the door from any cause, as such shaking is very annoying and disagreeable. The movement of the toggle and spring also assists in opening the door after the knob is turned, all of which will be more fully hereinafter described, and pointed out in the claims.

Heretofore pneumatic door checks have been made with connections which were fastened both to the door-casing and door, which rendered the door hard .to open and otherwise awkward to handle; but with this device the door is perfectly free, the same as if there were no check, either whether the check be on the door or on the casing, although it may be adapted to either with equally good results.

Referring to the drawings, in which the same letters indicate like parts in all the figures, Figure l represents a side elev ation of my improved door-check, the dotted lines showing the position of the toggle-arms when the door is in a closed position. Fig. 2 is a side elevation of the same. Fig. 3 is a vertical longitudinal section through the entire apparatus.

Fig. 4 is an enlarged detail view of the pistonhead. Fig. 5 is an enlarged view of the piston-head spring, clearly showing the springfingers for setting out the packing. Fig. 7 is a detail view of the toggle-joint and springarm connections. Fig. 6 is a detail view of one of the cylinder-heads, which also shows the stuffing-box for the piston-rod. Fig. 8 shows the check in position ready for use; also an angular supplementary bui-fer, which provides for the-angle of the door, so that the check comes in contact with the door on a straight line.

A is the cylinder' of the door-check, which may preferably be made of drawn tubing. B and C are the cylinder-heads, which may be secured in any approved manner. D is the piston-head, and E the piston-rod. The cylinder-head C is of very peculiar construction, and is cast with two wing-flanges, a b, and two bifurcated hinge-plates, c d, and stuffing-box y integral therewith. The ilanges a b are for the purpose of securing the door-check to the casing or the door, as'the case may be, and the bifurcated hinge-pieces are connections for the toggle-joint levers. The piston-rod E carries on one of its ends.the piston and on its other end a cross-head, F, which cross-head has a central bore for the piston-rod, a pair of bifurcated hinge-lugs, ef, and two upper projecting lugs, g h, in the latter of which is placed an anti-friction roller, c', which roller prevents the abrasion of the door while in contact therewith. The toggle-arms G H are formed at one end with a hinge link or eye, which engages with bifurcated hinge-flanges d f and c e, respectively, and at their central joint, I J, with laterally-projecting hinge-flanges. Between the inner flanges, I, and upon the pintle j, I locate spiral springs K, the end of which bears against the opposite hinge I J in such manner that the resiliency of the springs serves to bring the toggle-levers to an elongated position, but of course out of a straight line, as may be seen in Fig. l, the object being to bring the buffer back to a position to receive the shock of the door when it is violently shut. Thus it will be seen that when the door strikes the buffer ICO or check the latter will gently yield to the force I of the door and permit it to shut Without jar or noise, the operation of which will be more fully hereinafter described. The piston head and packing are made of a metallic diskV having serrations around its periphery. The divisions between the serrations form springs by which the packing is kept tight.-

The operation of the mechanism is as follows: The flanges a b are secured to the door or the casing,as may be preferred,the buffer end being arranged to strike either, so that wh en the door is slammed violently to it strikes the buffer z. The force being imparted to the piston-rod and piston the latter yields, displacing the air in the cylinder7 which forms a cushion, and permits the door to gradually advance to its place in the door frame or casing without noisev or shock, the toggle-lever taking the position shown in dottedlines. When the door is again opened, the spiral springs around the pintle act upon the toggle-levers, which are connected to the cross-head on the end of the piston-rod and the cylinder-head, and forces out the piston and rod to meet the action of the door when being again closed. An additional function of the spring-toggle is to assist in opening the door, as the springs commence to act just as soon as the door-fastening is released. In the door-checks now in use it requires considerable effort to open the door, the effort being exerted in displacing the air in the opposite end of the cylinder, al1 of which will be readily understood by persons familiar with this .class of inventions.

It is evident modifications may be made in the construction and arrangement of the parts Without departing from the spirit and scope of my invention; but

What I claim as new, and desire to secure by 4o Letters Patent, is

l. A pneumatic door-check the piston-rod of which is provided with spring toggle-levers acting in combination to draw the piston to one end of the cylinder, for the purpose sub- 45 stantially as described.

2. rlhe combination, in a pneumatic doorcheck having a cylinder and piston, of the rod provided with the cross-head, as described, the toggle-levers, and the springs, al1 being 5o arranged to operate as set forth.

3. A pneumatic door-check having one of its cylinder-heads provided with fastening devices or Iianges, astuffing-box, and bifurcated hinge-lugs, in combination with the spring 55 toggle-levers, in the manner and for the purpose set forth.

4. In a pneumatic door-check, the combination of the piston, the piston-rod, and the spi-ing toggle-levers, the springs being ar- 6o ranged on pintles Working in flanges formed on the toggle-joint, arranged for joint operation substantially as described.

5. The combination, in a door-check having In testimony that I claim the foregoing as In own I affix my signature in presence of two witnesses.

GILBERT R. ELLIOTT.

Vitnessesz' O. E. DUFFY,

F. R. HARDING. 

